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Finding the Fourth Proportional to 647.21, 893.05 and 425.74

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Solution

The fourth proportional to 647.21, 893.05 and 425.74 is: 587.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.21 : 893.05 = 425.74 : x
  2. Step 2: Convert to fraction form
    647.21/893.05 = 425.74/x
  3. Step 3: Cross multiply
    647.21x = 893.05 × 425.74
  4. Step 4: Simplify right side
    647.21x = 380,207.11
  5. Step 5: Solve for x
    x = 380,207.11/647.21
  6. Step 6: Final answer
    x = 587.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.